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W. ARBETTER.

auuosmcn sewmc MACHINE. APPNLICATION F|LE D APR. 5, .916.

1,322,510. Patentd Nov. 25, 1919.

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WOLE ARBETTEaoF ROXBURY, MASSACHUSETTS, ASSIGNOE. To ARBE'ITER FELLING MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

BLINDSTITOH SEwING-MAoHINE.

Specification of Letters Patent.

Patented NOV. 25, 1919.

Application filed April 5, 1916. Serial No. 89,020.

- To all whom it may concern.-

' to be limited to the particular type of mech- Be it known that I, IVOLF ARBETTER, a citizen of the United States, residing at Roxbury, county of Suffolk, State of Mas sachusetts, have invented an Improvement in Blindstitch Sewing-Machines, of wh ch the following description, in connection with the accompanying drawing, is aspecification, like characters on the drawmg'representing like parts.

This invention relates to a machine for making blind stitches designed particularly for use in felling, padding and other similar work in the manufacture of clothing. In its preferred form the invention is an improvement upon the Arbetter type of machme such as illustrated, for example, in the pat-. ents to Arbetter NO. 830,699 granted Sep tember 11, 1906 and No. 937,273 granted October 19, 1909.

Blind stitch sewing machines for tlns class of work, whether of the Arbetter or of other types comprise essentially a 'recipro eating needle and complemental stitch form'- ing mechanism located and Operating on the same side of the work together with means for'presenting superimposed layers of fabric to the stitch forming mechanism-so that the desired series of blind stitches. may be taken therein.

In the Arbetter type of machine the needle is curved and not only has the usual reciprocating movement but also has a bodily oscillation whereby it makes alternate stitches at an angle to. each other so that in the caseof felling work one stitch is parallel and close to the edge to be felled while the other enters the edge at an angle; the

. for presenting the superimposed layers of fabric to the stitch forming mechamsm comprises a suitable feeding.mechanism'and a device known as a bender whichat proper intervals pushes or pokes the fabric up into the path of the needle. But save as hereinafter set forth the present invention is not anism employed. 7 In blind Stitch sewing machines, and particularlyrin felling or similar class of work where the needle moves. close to and more or less parallel with the edge being felled or united to the base layer the needle frequently catches in the edge before it has reached the proper point ofstitch pene tration, and thus renders it impossible to make satisfactory work. The fabrics being stitched have to be guided by hand and by guides on the machine so that they will be properly related to each other and to the needle at the proper point of stitch penetration, and this requires that the fabric shall j be fed with the edge very close to the needle.

Heretofore the needle in its reciprocating movement on the retracting stroke has been withdrawn to a very marked extent and in machines of the character referred to fre-' quently to an extent equal to half of the complete stroke or reciprocation of the needle. This has been considered necessary-in order that the needle in its passage through the fabric and into cooperation with the complemental stitch forming mechanism may be properly timed to secure such cooperation and in order that time may be allowed for the feed of'the fabric after the needle has withdrawn.

The present invention resides in means for terminating the retracting movement of the needle immediately after the retraction of its point from the fabric and in its preferred form this means provides for a dwell in the movement of the needle immediately afterretraction-of its point from the fabric and until the next penetrating movement begins while in any case the movement of the needle is such as to secure a proper cooperation with the complemental stitch-forming mechanism.

The invention thus eliminates all the dif ficulties heretofore inherent in these machines causing the needle to catch in the fabric before the proper point of stitch penetration, and in fact leaves the needle so positioned after retraction from the fabric that it may itself form a guide against which the edge of the fabric maybe fed.

The objects and nature of the invention. will appear more fully from the accompanying description and drawings and, will be particularly pointed out in the claims.

The drawings represent so much of w a blind stitch felling machine of the Arbetter type as is necessary to a disclosure of the preferred form of the present invention;

In the drawings, v r A 7 Figure l is anend elevation with a portion of the front plate of the overhanging arm broken away ofthe machine with none of the mechanism in and below the work support being illustrated;

Fig. 2 is a top plan view of the presser foot showing the fabric in place for felling.

This machine comprises the work supporting table 1, the overhanging arm 2, the,

stationary presser foot 3, the yielding work support 1 and revolving hook 5 of the Wheeler & Wilson type all as illustrated in thebefore-mentioned patents. The feeding mechanism forming directly no part of this invention needs no illustration or description. The bender mechanism, which serves to push the fabric at the required time up through the opening '6' in the presser foot also needs no illustration or description for the same reason. i

The needle and its operating mechanism is of similar construction except for features required by the present invention as is shown in the before mentioned Arbetter Patent No. 937,273. The vertical rock shaft 7 in the overhanging arm carries at its lower end the needle carrying rock shaft 8 upon which at one end is mounted the needle carrying arm 9 with its curved needle 10, and on the other end the rock arm 11. In this Arbetter type of machine the vertical rock shaft 7 is oscillated through suitable connections from a barrel cam 12 to cause the needle at one reciprocation to move parallel with and at the next oscillation at an angle to the edge of a superimposed layer of fabric being felled to a base layer as the fabrics are fed through the machine in the usual manner. I

The oscillation or reciprocation of the needle in making each stitch is secured in the present invention in its preferred form by means which causes the needle to make one complete oscillation or reciprocation at each rotation of the main shaft13 of the machine, and during this rotation to cause the needle to dwell immediately after its point leaves the fabric on the retracting stroke and until the next penetrating movement begins leaving the movement of the needle during'the remainder of the stroke which is the movement required for the making of the stitch to continue to be of the 1 same character as that heretofore occurring in machines of this type.

V In the construction-illustrated the main shaft 13 is provided with a disk 14 having a face cam groove 15 of substantially the shape shown in the drawing. An adjustable link 16 has a ball and socket connection at its lower endwith the rock arm 11 and a ball and socket connection at its upper end with a stud 17 riding in a cam groove 15 while a rock arm '18 pivoted at 19 to the machine arm is pivoted at the op-' p-osite end to the stud 17. The cam groove 15 it will be'noted is so shaped as to provide the required dwell in the movement point.

of the needle after the pointof the needle withdraws from the fabric and until the next penetrating movement begins, This layer 20 has superimposed upon it one or;

more layers 21 presenting an edge 22 to be felled to the base layer. As these fabrics are fed through the machine the needle in one stroke passes parallel withthe edge 22 and close to the edge into the base layer 20 which is pushedup through theopening 6 by the bender mechanism, thus making a blind stitch. At the next stroke the needle turns at an angle to the edge 22 and enters beneath or at the edge 22 and .comes up through on top. These stitches are repeated alternately and the edge .22 is thus felled to the base layer 20. r

Heretofore the needle in its retracting stroke rose so high that as it moved downwardly it would frequently catch the, edge of the fabric at some point, frequently at a considerable distance before the proper point of stitch penetration had been reached, thus ruining the work. -Hence the edge as it entered thev machine had to be kept well away from the needle and twisted or guided indirectly to the position at the stitching In the present invention the needle in its retracting movement never passes more than a slight distance from the proper point of stitch penetration. This distance has been defined as a point immediately ad jacent and clear of the edge or a point immediately adjacent the proper point of stitch penetration. By these terms are meant to include any short distance sufficient to prevent the work from being caught by the needle before the proper time. 'With the present invention it is now possible for the edge of the fabricto be guided directly through the machine on the proper line of feed. As shown in the drawings it is now guided against the edge of the upturned 7 portion 23 of the presser-foot and if .the

work is at all thick or is heldupaway from the work support it may be guided directly against the needle 10 itself, without any danger of being caught 'by theneedle.

By causing the needle to'dwell after the point has retracted from the fabricand until the next penetrating movement begins the timing-of the needle with respect-to the 'complemental stitch forming mechanism is 111110 way interfered with and the feeding of the fabric is allowed the same time'for taking place as before. .But the invention in its broader aspects is not'to be limited to the movement in the needle in which a dwell takes place at this time because. it is obvious that the results of the invention can be secured by re-timing the movement of the needle so long as the needle in its retracting movement does not move'beyond a point herein referred to as immediately adjacent the proper point of stitch penetration, or a point where the needle will not be in danger of catching the fabric before it should do so.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A blind stitch sewing machine comprising a reciprocating needle and complemental stitch-forming mechanism both located and operating on the same side of the work, means for presenting superimposed layers of fabric to the stitch forming mechanism, and means for terminating the retracting movement of the needle immediately after retraction of its point from the fabric.

2. A blind stitch sewing machine com-.

' prising a reciprocating needle and complemental stitch-forming mechanism both lo cated and operating on the same side of the work, means for presenting superimposed layers of fabric to the stitch forming mechanism, and means for causing a dwell in the movement of the needle immediately after retraction of its point from the fabric and until the next penetrating movement bems. g .3. A blind stitch sewing machine comprising a reciprocating needle and complemental stitch-forming mechanism both located and operating on the same side of the work, means for presenting a main layer and the edge of a superimposed layer of fabric to the stitch forming mechanism, and means for restricting the end of the retracting movement of the needle point to a point immediately adjacent and clear of the edge of the superimposed layer.

4. A blind stitch sewing machine comprising a reciprocating needle and complemental stitch-forming mechanism both located and operating on the same side of the work, means for presenting a main layer and the edge of a superimposed layer of fabric to the stitch forming mechanism, and means for restricting the needle point to a path between a point immediately adjacent and clear of the edge and a point where the loop of needle thread will be in cooperative relation with the complemental stitchforming mechanism.

5. A blind stitch sewing machine comprising a reciprocating needle and complemental stitch-forming mechanism both located and operating on the same side of the work, meansfor presenting a main layer and the edge of a superimposed layer of fabric to the stitch-forming mechanism, and means for causing a dwell in the movement of' the needle immediately after retraction of its point from the fabric and until the neXt penetrating movement begins.

6. A blind stitch sewing machine comprising a main shaft, a reciprocating needle and complemental stitch forming mechanism both located and operating on the same side of the work, and means operated from the shaft to cause the needle point during each rotation of the shaft to move from a point immediately adjacent the proper point of stitch penetration into and through the fabric, into cooperation with the complemental stitchforming mechanism, back to the point of starting, and then to dwell while the feed takes place, whereby the needle is prevented from catching the fabric except at the proper point of stitch penetration.

7. A blind stitch sewing machine comprising areciprocating needle and complemental stitch-forming mechanism both located and operating on the same side of the work, means for presenting a main layer and the edge of asuperimposed layer of fabric to the stitch-forming mechanism, and means for eliminating reciprocating movement of the needle after its retraction from the fabric.

8. A blind stitch sewing machine com prising a reciprocating needle and c0mple mental stitch-forming mechanism both located and operating on the same side of the work, means for presenting a main layer and the edge of a superimposed layer of fabric to the stitch-forming mechanism, and means for causing the reciprocating movement of the needle to take place into and out of the fabric only to and from a point immediately adjacent the proper point of stitch penetration.

9. A blind stitch sewing machine comprising a main shaft, a reciprocating needle and complemental stitchforming mecha nism both located and operating on the same side of the work, means for giving one complete reciprocation of the needle for each rotation of the shaft, and means for causing a dwell in the movement of the needle immediately after retraction of its point from the fabric and untilthe neXt penetrating movement be ins to enable the feed to take place and prevent the needle from catching the fabric except at the proper point of stitch penetration.

10. A blind stitch sewing machine comprising a curved reciprocating needle and complemental stitch forming mechanism both located and operating on the same side of the work, means for presenting a main layer and the edge of a superimposed layer of fabric to the stitch-forming mechanism, means for bodily oscillating the needle to cause it to move alternately parallel with and at an acute angle to the said vedge, and means for causing a dwell in the movement of the needle immediately after retraction of its point from the fabric and until the next penetrating movement begins.

11. A blind stitch sewing machine comprising a curved reciprocating needle and complemental stitch forming v mechanism both located and operating on the same side of the Work, means for presenting a main layer and'the edge of a superimposed layer of fabric to the stitch-forming mechanism, means for bodily oscillating the needle to cause it to move alternately parallel With and at an acute angle to the said edge, and means for restrictingthe end of the retracting movementof the needle point to a point immediately adjacent and clear of the edge of the superimposed layer.

' In testimony whereof, I name to this specification.

WOLF ARBETTER.

have signed my 20' 

